Valve



Aug. 1, 1939. R. BISCHOFF 2,168,255

VALVE Original Filed Dec. 18, 1935 10 Sheets-Sheet 1 N OI InventorROBERT BISCHOFF dttomcg g- 1939- v R. BISCHQFF 7 2,168,255

" VALVE Original Filed Decj 18, 1935 10 Sheets-Sheet 3 I V glimmer R0 BERT BISCHOFF W'k. M

Gttorneg R. BISCHOFF Aug. 1, 1939.

VALVE Original Filed Dec. 18, 1935 10 Sheets-Shpet 4 r .w n e D an 3ROBERT BISCHOFF Q an W M attorney g- 1, .1939- R. BISCHOFF 2,168,255

VALVE Original Filed Dec. 18, 1935 10 Sheets-Sheet 5 Ihwcmor ROBERTBISCHOFF Ctrsrncu R. BISCHOFF Aug. 1, 1939.

VALVE Original Filed Dec. 18, 1935 10 Sheets-Sheet 6 QUwOJ U 5N mmN bwur mNN N mrN u N mwwovw mmm Anvcntor ROBERT BISCHOFF Gttomnj Aug. 1,1939. R. BISCHOFF 2,163-255.

VALVE Original Filed Dec. 18, 1935 10 Sheets-Sheet 9 o o N Summer ROBERTBISCHOFF attorney R. BISCHOFF Aug. 1, 1939.

VALV E 10 Sheets-Sheet 10 Original Filed Dec. 18, 1935 "Fig. I?

Znmemor ROB ERT BlSCHOFF Ctttorneg Patented Aug. 1, 1939 PATENT OFFICE2.168.255 VALVE Robert Bischoii, Morgan Smith tion of PennsylvaniaOriginal application Decem Divided March 10, 1939, Serial Claims.

This invention relates to valves 01 the type adapted to be automaticallyoperated to control the flow of fluid in a conduit, and is a division ofmy prior application for Letters Patent for Valve, filed in the UnitedStates Patent Ofllce December 6 18, 1935, Serial No. 54,998.

An improved fluid pressure operated cone type of plug valve is shown inUnited States Patent No. 2,078,231, granted April 27, 1937, on anapplication flled by Eugene C. Brisbane, and the present inventionrelates to an improved type of control valve device for the Brisbanetype of valve.

An object of the invention is to provide an improved control valvedevice for fluid operated u valve mechanisms having a rotary piston foractuating the valve plug operating mechanism. Another object of theinvention is to provide an improved means for controlling the operationof the control valve device in accordance with flow conditions in theconduit in which the main valve is installed.

Another object of the invention is to provide an improved control valvedevice of the above type in which means are included for successivelycontroling the fluid pressure employed for operating the control valve.

Another object of the inventio an improved control val mentioned, whichis s reliable and exact i tions of service.

The invention also comprises certain new and useful improvements in theconstruction, arrangement and combination of the several parts of whichit is composed, as will be hereinafter more fully described and claimed.

In the accompanying drawings:

Figure l is a vertical longitudinal section taken through the main valvebody showing the plug in closed position;

T Fig. 2 is a transverse section taken on the line 22 of Fig. 1, lookingin the direction of the arrow, showing the rotary piston and partsassociated therewith.

Fig. 3 is a plan of the control valve device associated with the mainvalve, the actuating means for the control valve being omitted;

Fig. 4 is a front elevation of the structure shown in Fig. 3;

Fig. 5 is a bottom plan of' the control valve device, showing the sameprovided with fluid "pressure operated means in the form of a diaphragmdevice;

Fig. 6 is a horizontal section-through the conol valve device taken onthe line 6-6 of Fig. 1;

n is to provide ve device of the character imple in construction, and 11function under all condi- Baltimore, Md., minor to S. Compan y, York,Pa... acorporaber 18, 1935, Serial and this application No. 266,906

Fig. 7 is a vertical longitudinal section of the control valve devicetaken on' the line l-l of Fig. 6, showing the same provided with asolenoid operating mechanism, the control valve being shown in closedpositio Fig. 8 is a view similar to Fig. 7, the control valve beingshown in the position in which the valve plug is open, the operatingmechanism for the control valve also being shown as the diaphragm deviceillustrated also in Fig. 5;

Fig. 9 is a detail horizontal section taken on the line 9-4 of Fig. 4,showing the primary pilot valve device for the power supply shut oilvalve mechanism of the control valve;

Fig. 10 is a vertical transverse section of the control valve devicetaken along the line Ill-l0 of Fig. 6;

Fig. 11 is an enlarg pilot valve device for valve shown in Fig. 10

Fig. 12 is an enlar throttling valve devic of Fig, 4;

Fig. 13 is a horizon line l3l3 of Fig. 10;

Fig. 14 is a plan of a valve having a diaphragm operated control valvemechanism, showing one way of connecting the chambers of the diaphragmto a source of fluid under pressure;

Fig. 15 is a detail section showing the piezometer connection of one ofthe diaphragm pipes on the valve body;

Fig. 16 is an enlarged ele the structure shown in Fig. 14, showing theflow tubes and associated parts; and

Fig. 17 is an enlarged section taken on the line ll-ll of Fig. 14.

Only so much of the construction and operation-of the main valve isherein shown and described as is deemed necessary for a clear under- 40standing of the operation of the control valve device-for the operatingmechanism of the main valve, since the main valve has been fully shownand described in the above mentioned Brisbane United States Patent No.2,078,231.

Referring to the drawings, and especially to Figs. 1, 14 and 16, theimproved valve comprises a main body or casing ll, having a cavity l2formed therein for a tapered plug IS, the cavity being intersected by alongitudinal waterway or opening it which constitutes a passage throughthe valve in the usual manner.

The plug I 3 also has a passage l6 therein.

The passages It and I 6' are round and both ed section of the secondarythe power supply shut off ged vertical section of the e taken on theline l2|2 tal section taken on the vation of a portion of formed are ofsubstantially the same diameter so that when the plug I3 is in openposition (not shown), a uniform bore will extend through the valve fromend to end.

The valve body II is preferably constructed from a single casting havinga tapered side wall, and the small end of the body is rounded, asindicated at 2i i.

A boss 2I is formed centrally in the small end of the casing II, saidboss having an opening 22 formed therein for a purpose to be hereinaftermore fully described.

The larger end of the valve body II is formed with an outwardlyprojecting flange 24 which has secured thereto by any suitable means,such as bolts 25, one of which is shown in Fig. 1, a correspondinglyformed flange 26 of the housing 21 of the operating mechanism of thevalve.

The housing 21, adjacent to the flange 26, is formed with a web 26.which constitutes a cover plate for closing the larger end of the cavityI2 of the valve body II.

The tapered plug I3 is supported for both axial and rotational movementinthe valve body.

At its lower or smaller end the plug I3 is formed with an extensionwhich constitutes a trunnion 39. The trunnion 39 carries a bushing Hwhich is mounted in a bushing 62 disposed in opening 22 heretoforereferred to.

Projecting from the top of the plug I3 and detachably secured to saidplug by bolts or the like 56, is the main shaft or stem 51 of the valve.

The web 28 of housing 21 is formed with a boss 58 having an opening 56therein in which is mounted a bushing 66. The valve stem 51 passesthrough the opening 56 and the bushing 66 constitutes the main bearingfor the valve stem.

A packing gland 6I disposed on the outer side i of the web 28 preventsleakage of fluid around 'the valve stem.

At a suitable distance beyond the web 26, the housing 21 is formed witha second web 64 having an opening formed centrally therein through whichthe valve stem 51 extends. Leakage of fluid around the valve stem 51 atthis point is prevented by packing gland 66.

The outer end of the housing 21 is formed with an outwardly projectingflange 61.

A cover 68, having a flange 69 engaging the flange 61 of the housing 21,is detachably secured to said housing by a plurality of bolts III. Thecover 63 is dome shaped, as shown in Figs. 1, 3, 5,6 and 14.

Formed integrally with the cover 63, is a central inwardlyprojectingboss II. A web I2 projects inwardly from the flanged portion of thecover and forms between it and the web 64, a chamber in whichis disposedthe operating mechanism of the valve. The boss II is formed with an'o'pening I3, and an opening I4 is formed centrally in the dome shaped wallof the cover 63.

The valve stem 51 is formed with various diameters. In Fig. 1 the mainportion of the valve stem is designated by the reference character 51,the intermediate section of the valve stem being indicated at I6,and'the third or outer portion of the stem being indicatedby thereference numeral 11. Between the portions 51 and I6 of the valve stem,there is a shoulder I6, and between the portions I6 and I1, there is ashoulder I9.

As shown in Fig. 1, the main valve stem 51 terminates within the bossII, and the extremity of said valve stem is threaded for a purp se to behereinafter described.

The valve operating means preferably comprises a fluid operated rotarypiston 35 and mechanism operated by said piston. The piston 66 isrotatably mounted in a suitable cylinder 64 formed in the housing 21.

As shown in Figs. 1 and 2, the piston 66 comprises a main body portion,annular in form, and a pair of diametrically disposed arms or blades 96and 91. which project outwardly from the annular body portion of thepiston. The arms 96, 91 constitute movable abutments, the purpose ofwhich willbe hereinafter fully described.

The valve stem 51 extends through the central portion of the piston 65,and carried by the valve stem and also by the piston, are parts of theoperating mechanism, as will be hereinafter more fully described.

As shown in Fig. 2, the diameter of the main body portion of the piston65 is less than the diameter of the cylinder 64, and the walls of thecylinder which enclose the piston are lined with thin sheets of suitablewear resisting material, as indicated at 98.

Disposed in the space between the side wall of the cylinder 64 and themainannular body portion of piston 95, and arranged diametrically to*each other, are spacer blocks or arms 66 and Hill.

These members are carried by the wall of the cylinder 96, being securedthereto by bolts or the like Ill. The spacer blocks or arms 63 and I"constitute fixed abutments which, together with the arms or wings 66 and91 ofthe piston 25, form chambers I02, I63, I04 and I65.

In order to rotate the piston 35, fluid under pressure from any suitablesource of supply may be used.

The valve in actual practice, when installed in a water pipe line, hasbeen actuated by water under pressure obtained either from the pipe lineto which the valve is connected, or to a separate source of supply.

Any suitable means maybe employed for sup-' plying fluid under pressureto the valve for the purpose of. operating piston 65, and any suitablemeans may be employed for controlling the supply of fluid under pressureto the piston chambers of the valve. In the present instance a suitablecontrol valve device is adapted to control the supply of fluid underpressure to the piston chambers, as will be hereinafter more fullydescribed.

As shown in Figs. 1 and 2, the valve operating and i26,'a pair ofmovableplates I21, I26, a single plate I26, and a pin I36, operativelyassociated with all of said plates, in the manner t be hereinafter morefully described.

Plates I25 and I26 are similar in form and construction. If so desiredthese plates may be circular in outline. Plate I25 is secured to the web64 of the housing 21, and plate I26 is secured tothe web I2 of cover 63.The plates I25 and I26 are respectively formed with substantiallycentral openings I33 and I36, through which the valve stem 51 extends.

The pin I36 is composed of a main cylindrical body portion, on theopposite ends of which, rollers I36 are rotatabiy mounted, said rollersbeing slightly larger in diameter than the main body of the pin, asshown in Figs. 1 and 2.

The plates I25 and I26 have correspondingly formed openings I31 therein,in which the rollers I36 of the pin I30 are disposed. The openings I31provide means for guiding the pin I36, and the contour of said openingsis shaped in a man- A mechanism comprises a pair of flxed plates I 26her to be hereinafter described, so that the pin I80 will be caused totravel in a predetermined path during the operation of the mechanism;

The movable plates I21 and I28 each comprise a circular disc having anopening I39 formed centrally therein, through which the valve' stemextends. These plates are connected to the piston 85.

Plate I21 has a surface which lies flush against the adjacent face ofthe fixed plate I28, and plate I28 has a surface which lies flushagainst the adjacent face of fixed plate I26. The opposite surface ofplate I21 is formed with a series of upwardly projecting serrations orteeth I88, and plate I28 is also formed with a series of similarserrations or teeth I85. The plates I21 and I28 are so mounted that theserrations I88 and I85 project towards each other.

As shown in Fig. 2, an elongated opening or slot I89 is formed in eachplate I21 and I28. The openings I89 are radially disposed and have awidth corresponding substantially to the thickness of the main bodyportion of the pin I and a suitable length to permit movement of the pinI80 in said slots from a point near the center of the plates I21 and I28, to a point near the outer edges or peripheries of said plates. Y

The plate I 29 comprises an annular body portion having a center openingI5I formed therein so that said plate can be mounted on the portion 16of the valve stem 51. In order to key said plate to said valve stem, theplate is formed withi grooves or recesses I52, and the valve stem 51 islikewise formed with grooves or recesses- I58, and keys I53 are mountedin the grooves or recesses I52 and I58.

For the purpose of preventing rectilinear movement of the plate I29 withrespect to the valve stem 51, a sleeve I55 is utilized. The sleeve I55is fitted on to the reduced portion 16 of the valve stem, one end ofsaid sleeve bearing against a shoulder I56 formed in the plate I29around opening I5I, as shown in Fig. 1. The sleeve I 55 is held inposition by means of a nut or collar I51 which is mounted on the threadsI58 of the section 11 of the valve stem.

The external diameter of sleeve I55 is approximately the same as thediameter of the main portion of the valve stem 51, and said sleeveneatly fits the openings I39 of plate I28.

Encircling sleeve I 55 and nut I51, is a sleeve I8I which is disposed inopening 13 heretofore referred to. The inner end of sleeve I9I is formedwith a flange which is secured to plate I28, so that rotation of saidplate also effects corresponding rotation of the sleeve I 8i.

The sleeve I 8i extends outwardly beyond the cover 68 and has mountedthereon a collar 8! carrying an indicator arm 82 for indicating theposition of the valve plug I3.

The interior of the sleeve I8I is made of a size to snugly engage nutI51, and this construction constitutes the third bearing for the valvestem.

When the parts are assembled, nut or collar I51 is screwed down tightand this action forces the opposite end of sleeve I 55 against theshoulder I56 of plate I29, so that said plate is forced tightly againstshoulder 18 between portion 16 and the main portion of the valve stem51.

In this way plate I29 is clamped tightly between the valve stem shoulder18 and the inner end of the sleeve I55, and consequently rectilinearmovement of plate I29 in either direction will effect a' correspondingmovement of the valve purpose to be hereinafter de- Plate I28 issomewhat thicker than plates I25, I28, I21 and I28 heretofore described,and both sides of plate I29 have serrations thereon. The serrations I8Ion one side of plate I29 engage the serrations N8 of plate I21, and theserrations I62 on the opposite side of said plate I29 engage theserrations I85 of plate I28.

As shown in Fig. 2, a semi-circular notch I88 is formed in plate I29,said notch having a diameter corresponding substantially to the diameterof pin I30, so that said pin can be positioned in said notch during theoperation of the device, in the manner to be hereinafter more fullydescribed.

Extending outwardly in opposite directions from notch I66, are arcuateperipheral surfaces I61, I68. A pronounced corner or shoulder I88 isformed where the surface I61 meets the notch I66, and a similar comer orshoulder I10 is formed at the inner end of the surface I88. The purposeof the corners or shoulders I69 and I18 wi l be hereinafter more fullydescribed.

When plate I29 is assembled on the valve stem 51 and connected theretoby key I53, and these parts are assembled in the valve with the valveplug I3 in closed position, notch I66 will be located in the positionshown in Fig. 2, and pin I88 engages surface I68 and thus preventsrotary movement of plate I29. Plates I 21 and I28 are also positionedrelatively to the plate I29, so that when the valve plug I3 is in closedposition, the serrations I6I and I62 of plate I29 will be partlyintermeshed, respectively, with the serrations I88 of plate I21 andserrations I 85 of plate I26.

- scribed.

With plate I29 thus disposed relatively to plates I21 and I28, whenrotary movement is imparted to plates I21 and I28, said plates will bemoved with respect to plate I29, which during such rotary movement ofplates I21 and I26 does not rotate, so that the relative position ofplate I29 with respect to plates I21 and I28 is shifted from theintermediate or partly intermeshed position to the position in whichserrations I6I of plate I29 are out of mesh with the serrations I88 ofplate I 21, and the serrations I 62 of plate I25 are fully meshed withthe serrations I85 of plate I28. In this way plate I29 is moved fartheraway from plate I 21 and nearer to plate I28, for a purpose which willbe hereinafter more fully described.

As shown in Fig. 1, in order to limit the above described outwardmovement of plate I29 with respect to plate I21, a stop I12 is provided,said stop in the present instance comprising a projection mounted onplatel29 adjacent the outer peripheral edge thereof and so positioned asto engage the surface of plate I28 when plate I29 moves outwardly in theabove described manner, and prevent further outward movement of saidplate.

Means are also provided for limiting the rotary movement. of the valveplug I3, and for this purpose the valve plug is formed with a lug I18which projects upwardly from the outer edge of the large end of theplug.

According to the construction herein shown and described, the valveillustrated is a two-way type of valve, and the plug I3 is adapted torotate through 90 from closed to open position, and vice versa.

Accordingly the inner surface of the wall of the valve casing II isformed with two projections or lugs I15 and I16 which are suitablyspaced apart. When the plug I3 is in closed po sition, stop lug I14thereof abuts the lug I16, and when the valve plug is in open position,lug I14 will engage lug I16. In this way, when the plug I3 is moved fromclosed to open position, bore I6 therein wil be correctly registeredwith the waterway I4, so that a smooth passage will extend through thevalve.

Since the serrations I44 on plate I21, serrations I on plate I28, andserrations I6I and I 62 on plate I29, constitute cam surfaces, plate I23functions as a lifter cam which is keyed to valve stem 51, and platesI21, I28 function as rotating cams which are keyed to the rotor orpiston 96. Also, fixed plates I25, I26 constitute means for guiding pinI30 so that said pin will interlock the three cams I21; I28 and I29after the plug I3 has been unseated, and disengage said three cams ateach end of 90 of rotation of the plug, alowing the plug I3 freedom ofaxial movement to either unseat or seat in both open and closedpositions.

It has been described that plates I25 and I26 are formed with openingsI31. which constitute guides for pin I30, said openings being adapted to:rcceive the rollers I36 on said pin.

In order to guide the pin during operation of the device, the openingsI131 are formed with a specific contour (see Fig. 2) which enable thepin to be guided in a predetermined path, and since the outer edges ofthe rollers I36 engage the edges of the walls of said openings, theseedges constitute cam surfaces.

During the operation of the valve plug actuating means the pin I30travels from a point near the end at the right of the openings, asviewed in Fig. 2, to a point near the end at the left of said openings,and in so traveling through the openings I31, the pin I30 is directedinto the notch I66 of cam plate I29, where said pin remains while theplug is being rotated. When the pin is disposed in notch I66, cam plateI29 will be interlocked with plates I21, I28, so that plate I29 willrotate with plates I21, I28. At

the completion of the rotation of the valve plug I3 from closed to openposition, pin I30 will move out of the notch I66 and engage surface I68of plate I29 again retaining said plate in position and preventingrotation thereof.

For the purpose of controlling the supply of fluid under pressureemployed for operating the rotary piston 95, a suitable control valvedevice 2I I is employed.

In the present instance, the control valve device 2II is shown mountedon the cover plate As shown in Figs. 6 and 7, the control valve devicehas a casing formed of three sections 2I2, 2I3 and 2I4, said sectionsbeing suitably bolted together. The intermediate section 2I3 constitutesthe main body of the control valve device and has formed therein achamber 2I5 for a sleeve type four-way valve 2I6.

The operation of the valve 2I6 is controlled by a plurality of valvedevices including a pilot valve 2I1 (Figs. 7 and 8), a power supply shutoff valve'2I8 (Fig. 10), a primary pilot valve device 2I9 for the powersupply shut off valve 2I8 (Figs. 6 and 9), a secondary pilot valvedevice 220 for the power supply shut off valve 2I6 (Fig. 11), and athrottling valve device 22I (Fig. 12); All of the above mentionedelements and devices are constructed and operated in the manner .to behereinafter referred to.

Referringv to Figs. 6, '1 and 8, for the pur- .as shown in Figs. 7 and8.

Pilot valve 2" is formed with spaced apart heads 230, 23I, said headsbeing connected by a reduced shank portion. a

The bore 229 is formed with three spaced apart chambers 232, 233 and234. Chamber 232 is connected to chamber 236 on one side of piston 226by a port 236, and chamber 234 is connected to chamber 231 on theopposite side of piston 226 by a port 233. when the control valve device2 is in closed position, head 23I laps port 233, thereby cuttin offcommunication between chambers 234 a d 231, and head 230 of the pilotvalve 2I1 closes passage 239 between chambers 233 and232.

The pilot valve 2I1 has a stem 230 which projects outwardly from thecasing of the control valve device and is connected to an actuator to behereinafter referred to.

Referring to Figs. 1 and 10, the power shut off valve 2I3 comprises amain body portion mounted in a bore 243 formed in the section 2I3 of thecontrol valve casing. The lower portion of the bore 243 is enlarged toprovide a chamber for a piston 244 for operating valve 2I8.

The upper end of valve 2I3 is formed with a conical surface adapted tonormally seat against a seat 246 formed at the lower edge of a chamber246.

Connected to chamber 246 is one end of a pipe 241 which leads from asuitable source of fluid under pressure. The fluid supplied through pipe241 is the fluid which is employed for operating the piston 96 of thevalve II, and the purpose of valve 2I3 is to control the entrance ofsuch fluid under pressure into the control valve device 2I I, in amanner to be hereinafter described.

Beneath the valve seat 245, there is a passage 243 which connectschamber 246 with a port 203 when the valve 2I3 is open.

As shown in Figs. 6 and 10, chamber 246 is connected to chamber 249 ofvalve device 2I9 by a pipe 263. 7

The amount of fluid permitted to flow through pipe 263is controlled bythrottling valve device 22 Leading from the pipe 260 is another pipe 25lwhich connects chamber 246 with chamber 252 on the lower side of piston244, as shown in Fig. 10. Chamber 262 is connected to chamber 253 of thesecondary pilot valve device 220. by a passage 264.

Chamber 266 on the upper side of piston 244 is connected to chamber 2I6by passage 256, as shown in Figs. 10 and 13.

Chamber 2| 6 is at all times connected to a sewer or the like. by a pipe261, so that any fluid within said chamber drains away from the controlvalve device.

As shown in Figs. 4, 6 and "I, the stem 246 of the pilot valve 2I1 isconnected to the extension III of the main valve stem by means of lever26I, link 262, and crank arm 263. The crankv arm 263 is formed on thecollar 3| heretofore referred to.

Adiustably mounted on the stem 240 of valve amazes 2| 1, is a block 254.Pivotally connected to said block by meansoi' pins'285 (Fig.23) is theupper -forked end of the lever 28I. The lower end of, lever 29I ispivotally connected to the link 282 by means of apin 208.

Secured to the section 2I2 oi the control valve casng, is a bracket 210.This bracket is open at the top and bottom, and has side walls and anouter end wall 21I.

Pivotally mounted to one of the side walls of the bracket 210, by meansof bolt 212, is a bell crank lever 213.

One arm 214 of the bell crank lever 213 is connected to lever 26I by apin 215. The other arm 218 of the bell crank lever 213 extends inwardlytowards the end 01' the casing of the control valve and has formedthereon a cam surface 211, the purpose of which will be fully described.

Referring 'now to Figs. 6 and 9, the primary, pilot valve device 2I9 forthe power supply shut on valve 2 I8, comprises a poppet valve 28Iadapted to normally seat against a seat 282 formed in the casing at oneend of chamber 249. the valve 28I being retained against the seat 282 bymeans of an expansible coil spring 283.

Fastened to the valve 28I and extending through a bore 284, is a stem285. The extremity of stem 285 projects beyond the valve casing andengages cam surface 211 of bell crank lever 213.

Cam surface 211 is formed, as shown in Figs. 4 and 9, with a depressedportion 288, in which the extremity of the valve stem 285 is disposedwhen the valve 28I is seated. Movement of hell crank lever 213 in eitherdirection from the position shown in Fig. 4, causes the extremity of thevalve stem 285 to slide out of the depressed or notched portion 286 ontothe cam surface 211, and this action moves the valve 28I away from seat282, compressing spring 283.

In order to prevent leakage of fluid from valve chamber 249 through thebore 284, suitable packing material 281 is employed, as shown in Fig. 9.

As shown'in Fig. 6, bore 284 is connected to chamber 2I5, by a passage283, so that when the valve 28I is unseated, fluid will flow fromchamber 249 to chamber 2I5, and from thence to the sewer.

Referring now to Fig. 11, the secondary pilot valve 220 for the powersupply shut off valve 2I8 comprises a poppet valve 29I adapted tonormally seat against a seat 292 formed at one end of chamber 253, thevalve 29I being retained against seat 292 by means of an expansible coilspring 293.

Fastened to valve 29I and extending through a bore 294, is a stem 295.The extremity of stem 295 projects beyond the valve casing and engagescam surface 298 on collar 8I.

As shown in Figs. 4, '1, 8 and 11, cam surface 296 is formed with a pairof spaced depressions 291, 298.

When the main valve plug I3 is in closed position, the end of valve stem295 is disposed in depression 291, and when the main valve plug I3 is inopen position, the end of valve stem 295 is disposed in depression 298.When plug .I3 is turned from closed to open position or vice versa, theend of stem 295 rides out of either depression onto the cam surface 296and this action effects movement of valve 29I away from seat 292, sothat communication is established from chamber 253 to chamber 299.

Chamber 299 is connected to the sewer pipe 251 by means of pipe 300 sothat the fluid in said hereinafter more chamber can drain away (see Fig.5).

Referring to Figs. 6, 7 and 8, the main body of valve 2 I9 iscylindrical in form, having spaced apart heads 303 and 304 at oppositeends of the cylindrical body. The body of the valve 2I6 is hollow andopen at each end, thereby permitting the flow of fluid through the valvechamber 2I5 from end to end thereof.

As shown in Fig. 10, the cylindrical portion of the valve 2I0 isconnected to the stem or rod 221, by a plurality of arms 305, the innerends of said arms being formed with collars 308 which encircle the valvestem and are fixed thereto by means of a pin, as shown in Figs. 7 and 8.

A plurality of ports 301, 308 and 309 are formed in the valve casing.sure port, being connected to the pressure supply pipe 241 when thevalve 2I8 is unseated. Ports 301 and 309 are disposed on opposite sidesof port 308, port 301 being controlled'by head 303 of the valve 2I8, andport 309 being controlled by head 304 of said valve.

As shown in Figs. 2 and 6, port 301 is connected respectively, tochambers I02 and I04, heretofore referred to, by means of a passage 3I0and ports 3 and 3I2, passage 3I0 being formed in the cover plate 68.

Port 309 is connected to chambers I03 and I04 of the rotary piston 95,by passage 3I3 and ports 3| 4 and 3I5, respectively.

When the control valve device is in closed position, valve 2"; is sopositioned that ports 309 and 308 are connected, and port 301 is incommunication with chamber 2I5. With the valve 2I6 in this position,chambers I02 and I04 of the rotary valve piston 95 are connected to thesewer pipe 251 so that there is no fluid under pressure in said chambersand rotary piston chambers I 03 and. I05 will be connected to the sourceof fluid under pressure. With fluid under pressure thus supplied tochambers I03 and I05, the rotary piston 95 will be positioned as shownin Fig. 2.

For the purpose of limiting the rectilinear movement of valve 2I6 inboth directions, suitable means are provided, as will be next described.

Threaded into the end wall of piston chamber 235 is a rod 3 I 1, theinner end of which is adapted to engage the end of the valve stem 221,as shown in Fig. '1, when piston 225 is in valve closed position. Rod3I1 may be locked in its adjusted position by means of a lock nut 3I8.

For the purpose of limiting the movement of valve 2I8-when the sameslides from closed to open position there is employed a stop devicecomprising a sleeve 320 having external threads 32I mounted in asuitable threaded bore 322 in the section2l4 of the valve casing, theouter end of the sleeve being enlarged to provide a head which may beengaged by a suitable tool, such as a wrench, for turning the sleeve.

The sleeve 320 is formed with internal threads adapted to engage athreaded rod 323. The inner end of the rod 323 is formed with a head orenlargement 324, and the outer end of the rod carries a hand wheel 325.

When the partsof the control valve device are being assembled and withthe head 324 of rod 323 bearing against the inner end of the sleeve 320,the sleeve is screwed into the bore 322 to the position in which thehead 324 engages the end of valve stem 221 when the valve 2I6 is in theopen position shown in Fig. 8. When the sleeve has been correctlypositioned, it may be locked in such position by set screw 326.

from the valve device 2 Port 308 functions as a pres-' Any suitablemeans may be employed for operating the control valve deviceautomatically. In the present instance, and as shown in Fig. '1, thestem 243 of pilot valve 2" is shown operatlvely connected to anelectrically operated mechanism, which may be in the nature of asolenoid 33I. While in Figs. 5 and 8, stem 243 is shown operativelyconnected to a fluid pressure operated device, such as a diaphragmdevice 332.

In the case where pilot valve stem 243 is connected to a diaphragmdevice, the same is directly connected t'othe diaphragm 333 of suchdevice, as shown in Fig.3.

On the other hand, when the stem 243 is connected to a solenoid device,it has been of advantage to connect the same to the plunger element 334of said solenoid by suitable links and levers, such as bell crank lever333 and link 333, shown in Fig. "I.

It will be understood that the same operation of the pilot valve 2" canbe effected by using either a solenoid device 33I, or a diaphragm device332, since bothof these devices will function to move the pilot valve 2"when it is desired to operate the control valve device.

As shown in Fig. 8, the diaphragm device 332 may be of any approvedconstruction and chambers 331, 333 on opposite sides of the diaphragm333 are adapted to be connected to a suitable source of fluid underpressure by means of pipes 333, 340, which lead, respectively, from saidchambers. The movement of the diaphragm 333 is limited by stops 3 and342 formed in the casing of the diaphragm device on opposite sides ofsaid diaphragm, as shown in Fig. 8.

When the control valve device is in open position the diaphragm 333 willbe seated against stop 342, due to the excess of fluid under pressure inchamber 331 acting against the pressure of fluid in chamber 333 and alsoa spring 343 on the side of the diaphragm having seat 342.

In operation, since the entire valve device is automatically operable,when the valve plug I3 is in closed position, the control valve device 2will first be operated either by the solenoid device 33I or thediaphragm device 332 to effect rotation of the valve plug from theclosed position shown in Fig. l to open position.

Accordingly, the first mechanism that operates is either the solenoiddevice 33I or the diaphragm device 332, and, obviously, the operation ofeither one of these devices will result in the control valve device 2| Ibeing operated.

Since the pilot valve 2I1 is directly connected to the initial operatingelement (solenoid device 33I or diaphragm device 332) said pilot valve2" will be actuated first. I

As shown in Fig. 7, in closed position, piston chamber 233 is connectedto the sewer pipe 231, through port 233, passage 2 in valve 2", passage242, and chamber 2I3. Therefore, when the pilot valve 2I1 is shiftedfrom the position shown in Fig. '7 to the position shown in Fig. 8,fluid under pressure will be supplied to piston chamber 233 from port333, through pipe and pas sage 3I3, chamber 233, passage 233, and port233.

Simultaneous with the movement of pilot valve 2I1 from the positionshown in Fig. 7 to the position shown in Fig. 8, bell crank lever 213will also be operated and in its operation, the stem 233 of the primarypilot valve device 2I3 will be moved to the right (Fig. 9) due to themovement of the depressed portion 233 in the cam surface 211 away fromthe end of said stem. This action unseats valve 23I, thereby ventingchamber 243 to the sewer pipe 231, through passage 233 and chamber 2 I3.

When chamber 243 is vented, as has just been described, fluid underpressure in chamber 232 (Fig. 10), will also be relieved. since chamber232 is connected to chamber243, through pipes 23I and 233.

with the relieving of pressure in chamber 232 the pressure in chamber243, acting against the top of valve 2", forces said valve downwardly.permitting fluid under pressure to flow into chamber 333, throughpassage 243. In this way. fluid under pressure is supplied in sufllcientvolume to piston chamber 233 to force piston 223 towards the right tothe position shown in Fig.

,8. This action eifects a corresponding move- ,ment of sleeve valve 2I3.

when the valve 2I3 has thus been moved to open position, port 333 willbe unlapped, so that piston chambers I33 and I33 will be connected tothe sewer pipe 231, respectively, through ports 3, 3I3, passage 3I3,port 333, and chamber 2I3.

At the same time, port 333 will be connected to port 331 by valve 2I3,so that fluid under pressure will be supplied from the main supply pipe241 to e 3I3, and from thence to piston chambers I32 and I34, throughports 3 and 3I2, respectively.

,Fluid under pressure supplied to piston chambers I32 and I34, acting onthe movable abutments provided by piston arms 33 and 31, will rotate thepiston 33 in the direction of the arrow, Fig. 2.

During approximately the first 15 movement of piston 33, the valve plugI3 is unseated and this action is effected in the manner to be nextdescribed.

It has heretofore been explained that pin I33 engages surface I33 of camplate I23. when rotation of the piston is initiated, cam plates I21,I23, acting on the shank of pin I33, tend to move said pin along withthem. However, since pin I33 is guided by the openings I31 in flxedplates I23, I23, said pin will be caused to move inwardly anddownwardly, due to the inclination of the side walls of the pin guideopenings I31 in which pin I33 is disposed.

During the initial movement of piston 33, cam plate I23 remainsstationary, since there are no means connecting or interlocking saidplate with cam plates I21 and I23, but cam plates I21 and I23 rotate andin so doing the lower cam plate I21 slides radially on the'lower surfaceof cam plate I23, thereby imparting a straight line axial movement tocam plate I23, valve stem 31, and plug I3, so as to unseat said plug.This axial movement is the result of the inclined surfaces of theserrations I32 of cam plate I23 moving up the inclined surfaces of theserrations I43 of cam plate I23 and the inclined surfaces of theserrations I3I of cam plate I23 moving up the inclined surfaces of theserrations I44 of cam plate I21.

Since the valve stem I31 is connected to cam plate I23 in the mannerheretofore described, movement of the cam plate I23 towards cam plateI23 will cause plate I23 to urge sleeve I33 outwardly with it, and thisaxial movement of the sleeve istransmitted through nut I31 to valve stem31, so that said valve stem is also moved axially a correspondingdistance, thereby axially moving the plug I3 and unseating the same. Dueto the inclination of the side walls of the valve body II and plug I3,only a slight axial movement or the plug is required to unseat the plugand permit the same to rotate freely in cavity I2.-.

During the rotary I21, I28relative to cam plate l29"which takesplace'duringthe first 15 rotation of piston 96, pin I30 will move downsurface I88 of cam plate -I29 towards the notch I66, and when the camplates I21, I28 have been rotated approximately 15, pin I30 will bedisposed in the notch-I66 with the side of said pin abutting shoulderI69 of cam plate I29.

When the pin I30 engages shoulder I89 continued or further movement ofpiston 96 and cam plates I21, I 28 carried by said piston, will resultin a corresponding movement being imparted to said cam plate I29, andconsequently since the valve stem 61 is keyed to plate I29, the plug I3will also be rotated.

When the pin I30 moves into engagement. with shoulder I69, guideopenings I31 cause thepin to drop into the bottom of notch I66 andinterlock cam plate I29 with em plates I 21 and I 28.

When the plug I3 has been rotated in the above described manner, throughthe interlocking of cam plate I29 with cam plates I21, I28 oi.

the operating mechanism, through an angle of 90, lug I14 0! the plug I3strikes the stop lug I16, and further rotation vented.

When lug I14 engages stop lug I16, pin I30 has been partly moved out ofnotch I66, due to the camming action of the pin guide openings I31 ofplates I25, I26. This camming action will cause the pin I30 to ride upover shoulder I68 and during continuous rotary movement of piston 95 and'cam plates I21, I28, said pin engages the arcuate surface I61 01' plateI29, and in so doing permits said cam plate I29 to remain stationary.

When the pin I30 is removed from the notch I66 in the manner justdescribed, the interlock between cam plates I21, I28 and cam plate I29is broken, and this action takes place when the valve plug I3 has beenrotated to its wide open position.

Since piston 95 and cam plates I21, I28 continue to rotate after thevalve plug I3 has been turned to its fully open position, cam platesI21, I28 will continue to move relatively to camplate I29 which is nowstationary, and this movement of cam plates I21, I28 relative to thenonrotatlng cam plate I29 permits the serrations I6I, I62 of cam plateI29 to, respectively, move down serrations I44 of cam plate I41 andserrations I45 of cam plate I28, whereby cam plate I 29 is shiftedtowards the right (Fig. l), and this action causes a corresponding axialmovement of the valve stem 61 so that the valve plug I3 is again moveddownwardly of the casing and seated.

From the foregoing it will be noted that during the initial rotarymovement of piston 96, the valve plug I3 is unseated, that during theintermediate rotary movement of said piston, the valve plug is turnedfrom closed to open position, and that during the final portion of therotary movement of said piston the valve plug is reseated. This actionis effected by first rotating the piston 95 with said piston uncoupledfrom the valve stem, then automatically coupling the piston 95 to thevalve stem so that the valve plug will turn together with the piston,and then automatically uncoupling the piston from the valve stem so thatsaid piston can continue to rotate without further imparting rotation tothe valve of the plug Ills pr movement of cam plates.

7 plug It will be further noted that means are provided for moving thevalve stem axially of the valve casing through means operatedby therotating-piston in cooperation with non-rotating means operativelyconnected to said valve stem so as to efiect the unseating and reseatingof the valve plug during the periods the rotating piston is. uncoupledfrom the valve stem.

It has been described that collar-8| on sleeve I8I is connected to camplate I28, therefore, any rotary movement of cam plate I28 will cause acorresponding rotary movement being imparted to collar 8i. Since collar8I is formed with a cam surface 296, which ca'm surface is engaged by thvice. 2 obviously said valve device will be actuated'by movement ofcollar 8I.

As shown in Figs. 4 and 11, when the valve is in closed position, valvestem 291 of cam surface 296, so that the .valve -29I is seated. When thecollar-3i rota'tes'as the result of the rotation of. :piston 95heretofore described, valve:stein=',296i:will move out .of thedepression' 29L'onto. thehlgher part of cam surface 296,- and, thisaction unseats valve 29I, so that under pressure in piston chamber 262is vented through passage 254, chambers 253, 299, and pipe 300 (see alsoFig. 10). In this way there will be no fluid under pressure in chamber262 during the entire'rotary movement of piston 95.

After rotary piston 95 has completed its movement, valve stem 295 willdrop into depression 298, therebypermitting the valve 29I to seat andcut off communication from the piston chamber 262 to the sewer pipe 251.

Since. chamber 252 is connected to the source of supply of fluid underpressure in chamber 246, through pipes 258 and I, when valve 29I isseated, fluid under pressure will build up in chamber 252, the rate atwhich the fluid builds up in said chamber being controlled by means ofthe throttling valve device 22I shown in Fig. 12.

Since the area of piston 244 is greater than the area of the top of thevalve 2I8,'when the fluid under pressure in chamber 252 has built up anamount suificient to overcome the pressure in chamber 246 acting on thetop of valve 2I8, said valve will be moved upwardly into engagement withseat 245, thereby cutting oil the supply of fluid under pressure fromthe main pipe line 241 to the chambers of the rotary piston 95.

With the valve 2| 8 thus closed, fluid under pressure will be bottled upin chamber 308, and also in piston chambers I02, I04, so that the rotarypiston 95 will be retained in valve open position.

Since the lever 26I is connected to collar 8I through link 262 and crankarm 263, rotation of collar 8| in the manner heretofore described willshift the position of the lever 26I from that shown in Fig. 7 to thatshown in Fig. 8. Since one arm of the bell crank lever 213 is connectedto the lever 26I, the bell crank lever 213 will also be actuated so thatit is returned to the position shown in' Fig. 4, thereby bringing thedepressed portion 286 of cam surface 211 in alinement with the extremityof the valve stem 285 so that the valve 28I is seated. With the outletfrom chamber 249 thus closed, fluid under pressure in chamber 252 willnot be permitted to escape from chamber 262 are connected through pipes250 and 25I, as has been heretofore described.

Referring now to Fig. 8, it willbe noted that stem 296 of the secondarypilot valve de-.

296'is in depression 252, since chambers 249 and the rightend of. valvestem 221 abuts the enlarged portion 324 of rod 323.

Since valve devices of the type herein described when mounted in a waterpipe line or other pipe lines carrying fluid are adapted to remain inopen position for extremely long periods of time, it is possiblethatsome of the parts of the operating mechanism may get corroded so thatmovement thereof in the desired manner may be prevented, or if notprevented, slightly retarded, thereby hindering the functioning of suchoperating elements.

Thus, if the valve 2I6 should become stuck within the chamber 2I5 whenin the open position as shown in Fig. 8 and failed to move from suchposition to its other position when the control valve device isoperated, by manipulating the hand wheel 325, the valve stem 221 can beforced towards the left as viewed in Fig. 8, thereby breaking the sealbetween the valve 2I5 and the wall of the chamber 2l5 and permittingfree sliding movement of the valve in the casing.

Since the rod 323 has a head 324 on its extremity, after the valve stem221 has thus been moved away, the hand wheel 325 can be turned back inthe opposite direction, thereby backing the rod 323 away from the end ofthe valve stem 221, and such reverse movement of the rod will bearrested when the head portion 324 thereof abuts the inner end of thesleeve 320. Since the sleeve 320 is disposed in the desired adjustedposition, it will be obvious that when the rod 323 is thus retracted inthe sleeve the parts will again be in proper adjusted position.

When the valve plug I3 closes the reverse operation occurs.

First, the actuator (solenoid 33I or diaphragm 333) for the pilot valve2Il1 operates to shift the position of the pilot valve 2" from theposition shown in Fig. 8 to the position shown in Fig. 7.

By this action, fluid under pressure which was supplied to pistonchamber 235 is vented to the sewer pipe 251, through port 235, passage 2and 242, and chamber 2I5, and fluid under pressure is supplied to pistonchamber 231 from chamber 308, through pipe and passage 3I6, chamber 233,and port 238, so that piston 225 is moved toward the left (Figs. 6, 7and 8) thereby shifting the valve 2I5 from the position shown in Fig. 8to the position shown in Figs. 6 and '1.

When the valve 2I6 has thus been moved, port 301 will be connected tochamber 2I5 thereby permitting fluid under pressure in chambers I02 andI04 to pass to the sewer through passages 3I0, port 301, chamber 2I5 andpipe 251, and port 308 will be connected to port 309.

Simultaneous with the movement of pilot valve 2I1 from the positionshown in Fig. 8 to the position shown in Fig. 7, bell crank lever 213will also be operated in the manner heretofore described to unseat valve28I of the primary pilot valve device 2I9, and permit fluid underpressure in piston chamber 252 (Fig. 10) to be relieved, so that valve2I8 i unseated and fluid under pressure is supplie to chamber 308 frompipe 241.

Referring to Figs. 2, 6 and 7, with ports 308 and 309 connected in themanner above described, fluid under pressure will be supplied tochambers I03 and I05 of the rotary piston 95 from supply pipe 241,through chambers 248, 248, 308, port- 309, passages 3I3, and ports 3I4.

With fluid under pressure thus supplied to piston chambers I03 and I05,piston 95 will be rotated in a clockwise direction (Fig. 2)- so thatarms 93 and 91 thereof are moved through an angle of approximately 120back to the position shown in Fig. 2.

During the flrst rotation bf piston 95, the plug I3 will be unseated asthe result of c'ar'n plate I21 sliding radially on the cam surfaces I6Iof cam plate I29, to effect straight line axial movement of the camplate I29, valve stem 51 and plug I3 in the manner heretofore described.

timing the next 90 rotation of piston 95 the plug I3 will be turned fromits open to its closed position, on account of the interlocking of camplate I29 with cam plates I21, I28, resulting from pin I30 beingdisposed in notch I66 of cam plate I 9.'

When the plug I3 has been turned back 90, lug I14 thereof will engagestop lug I15 (Fig. 1) so that further rotation of said plug isprevented, and simultaneously pin I30 will be disengaged from notch I56,thereby uncoupling cam plate I29 from cam plates I21, I28, so thatduring the final 15 rotation of piston 95, cam plates I21 and I28 willslide radially on the cam surfaces of plate I29, thereby forcing camplate I29, valve stem 51 and plug I3 in a straight line axially toreseat said-plug I3. At the end of the last 15 rotation of piston 95 theparts will be restored to their respective positions, as shown in Figs.1 and 2.

Since collar 8i on sleeve I8I is connected to cam plate I28, the rotarymovement of cam plate I28 above described causes a corresponding rotarymovement being imparted to=collar 8i, and this action causes valve stem295 of the secondary pilot valve device 220 to ride up out of depression298 on to cam surface 296. This action unseats valve 29I so that fluid'under pressure in piston chamber 252 is vented through passage 254,chambers 253, 299, and pipe 300 (see Figs. 4, 10 and 11). In this waythere will be no fluid under pressure in chamber 252 during the entirerotary movement of piston 95.

After rotary piston 95 has completed its movement, valve stem 295 willdrop into depression 291, thereby permitting valve 29I to seat and cutoff communicat on from piston chamber 252 to the sewer pipe 251.

Since-chamber 252 is connected to the source of supply of fluid underpressure in chamber 246, through pipes 250 and 25l, when valve 29I- isseated, fluid under pressure will build up in chamber 252 as hasheretofore been described, and valve 2I8 will be moved upwardly intoengagement with seat 245. In th s waythe supply of fluid under pressurefrom the main pipe line 241 to the chambers of the rotary piston 95 willbe cut ofl.

With the valve 2I8 thus closed, fluid under pressure will be bottled upin chamber 308, and also in piston chambers I03 and I05, so that therotary piston 95 will be retained in valve closed position.

Rotation of collar 8I in the manner described shifts the lever 25I fromthe position shown in Fig. 8 to that shown in Fig. '7. This actionoperates bell crank lever 213 so that primary pilot valve 2I9 isactuated to close chamber 249. With the outlet from chamber 249 thusclosed, fluid under pressure in chamber 252 will not be permitted toescape from chamber 252 and consequently valve 2I8 will be retainedseated against seat 245.

As shown in Figs. 14, 15, 16 and 17, pipes 339 and 340 may beoperatively connected to the conduit in which the main valve isinstalled so that the fluid under pressure in the conduit can beutilized for operating the diaphragm device 332.

, side of the plug I3 In the present instance one end of pipe 338 isshown terminating at a piezometer 348 on one side of the plug H (seeFig. 15).

On the other hand, pipe- 348 leads to a chamber 34! of an ejector-.348.

Proiecting into chamber 341'is a tapered or conical tube 343, the outerend of which is connected to a pipe 358.

The other end of pipe 350 terminates as shown at 35L in the waterway I401' the valve on the opposite to the side having the piezometer 346 (seeFigs. 14 and 16).

Flow through the valve from a pump or blower is in the directionindicated by the arrow, Fig. 14, and pipe 350 has an opening 352disposed so as to intercept the fluid flowing through the valve when apump or blower is operating as is well known in the art.

Leading from chamber 341 of the ejector 348 and disposed axially withrespect to tube 343, is a second tapered or conical tube 353, the outerend of which is connectedto a pipe 354.

The other end of pipe 354 terminates, as shown at 355, in the waterwayl4 of the mainvalve on the same side of the plug 13 as is the en d35I01' pipe 358 heretofore referred to. However, opening 356 in the end ofpipe 355 is disposed, as shown in Fig. 16, in the opposite direction ordownstream with respect to the disposition of the opening 352. Pipes 358and 354 constitute flow tubes.

As shown in Fig. 17, the smaller or inner end of tapered tube 353 of theejector is flared outwardly and this inner end of tube 352 is disposedin suitable spaced relation with the inner or smaller end of the tube349. Tube 343 projects into chamber 341 a suitable distance to provide athroat having a restricted area.

When the main valve is installed in a conduit leading from a pump orblower, the valve may function as a check valve so as to automaticallycut oil communication through the conduit when the pump or blower shutsdown. In such installations the piezometer 348 is connected to theopening side of the diaphragm 333 (see also Fig. 8) and the closing sideof said diaphragm is connected to the ejector device 348 by pipe 340, ashas been described.

Assuming that the main valve is closed and the pump or blower is startedup, pressure is developed on the pump side of the valve slightly inexcess of the static pressure on the opposite side of the closed plugl3. This pump pressure is transmitted to the diaphragm chamber 331,through piezometer 348 and pipe 339, and diaphragm 333 moves to openposition (see Fig. 8), since the fluid pressure thus built up in chamber331 exceeds the combined pressure of fluid in diaphragm chamber 338,plus the pressure of spring 343.

Movement of the diaphragm 333 to open position effects opening of themain valve plug l3 through the action of control valve device 2| I, ashas been heretofore described.

As soon as plug l3 starts to open, flow is created through the waterwayI4 01' the main valve, and therefore, a flow is also created through theflow pipes 350 and 354 and the ejector device 348.

Due to the factthat the throat area in the ejector 348 is smaller thanthe area of the flow pipes 358 and 354, the velocity through the throatof the ejector is in excess of the velocity in the flow tubes 350 and354 and this excess velocity produces a static pressure at the throatwhich is' lower than the pressure in the main valve waterway I4 or theflow tubes 358 and 354.

As heretofore mentioned, ejector chamber 341 closing side' of thediaphragm 338), and therefore, the reduced static pressure at the throatof the ejector is transmitted to diaphragm chamber 338 through pipe 340,so that the pressure of' fluid in chamber 338 remains lower than thepressure of fluid in chamber 331 and the diaphragm 333 is held seatedagainst seat 342 as long as the valve plug I3 is open and there is flowthrough waterway l4 in the direction of the arrow, Fig. 14.

It should be noted that the tension of spring 342 is adjusted to exert aforce slightly lower than the resultant forceof the lower pressure onthe area of the diaphragm 333, and the combined functions of the 350 and354, hereinabove described, result in maintaining the diaphragm in theopen position shown in Fig. 8, and consequently the -main valve plug I3is in. open position, until such time as velocity through the waterwayi4 ceases and the ejector device 348 becomes ineffective, due to lack ofvelocity. For instance, when the pump or blower ceases to operate, and,therefore, flow through the conduit in which the main valve is installedceases, since the flow of fluid through the ejector device 348 will alsocease, the static pressure in chamber 341 will correspondingly increaseand such increase in fluid pressure will be conducted to diaphragmchamber 338 so that the pressure on both sides of the diaphragm 333becomes equal. The force of spring 343 acting on one side of thediaphragm 333 will then move the diaphragm to its closed positionagainst seat 3 and this action results in the main valve plug l3 beingmoved to its closed position through the action of the control valvedevice 2| I, as has been heretofore described.

Having thus described my invention, what I claim is:

1. The combin/ation with a valve body having a plug movable therein forcontrolling communication throughfthe valve, said plug having anoperating stem, mechanism for operating the plug including a fluidpressure operated piston operatively connected with said stem, a controlvalve device for controlling operating fluid to said piston, means forcontrolling the operation of said control valve device and including apilot valve, means operatively connecting said plug stem with saidcontrol valve operating means, and an auxiliary pilot valve device forsaid control valve device operated by said connecting means.

2. The combination in a valve mechanism comprising a valve casing havinga chamber, a movable valve element within said chamber for controllingfluid power from the chamber to a plurality of ports connected to saidchamber, means for actuating said valve element in opposite directionsincluding fluid pressure opening and closing chambers, a control valvefor controlling fluid pressure in said opening and closing chambers,means for operating said source of fluid power supply, a shut ofl valvefor controlling the fluid power to said valve casing chamber, a primarypilot valve device for said shut off valve, a secondary pilot valvedevice for said shut ofl valve, and means operative by said controlvalve operating means for successively operating both of said pilotvalve devices.

3. The combination in a valve mechanism comprising a valve casing havinga chamber, a sleeve valve within the chamber for controlling fluid powerfrom the chamber to a plurality of ports is connected to the 333(chamber piezometer 346 and flow tubes control valve, a

connected to the chamber, a source of fluid power 7 a secondary pilotvalve device for said shut of! supply. a fluid pressure actuated valve;for controlling the fluid from said power supply to said chamber; meansforoperating said sleeve valve, a primary meanslior controlling theoperation of said power supplycontrol valve, a secondary means forcontrolling the operation of said power supply control valve, and meansconnecting said sleeve valve operating means with said primarycontrolmeans and said secondary control means valve, means jor operatingsaid movable valve" element, and means operatively connecting said valveelement operatingmeans with said primary pilot valve device and with:said secondary pilot valve device for successively actuating bothvofsaid pilot valve devices. .r

5. The combination in a valve mechanism comprising a valve casing havinga chamber, a movablei valve element within said chamber for controllingfluid power trom the chamber to a plurality oi. ports connected to saidchamber, a source of fluid power supply, means for controlling'the fluidpower supplied to said chamber, means for operating said movable valveelement,

and means operable by said valve element oper- 15 ating means forcontrolling the operation of said fluid power controlling means.

ROBERT BISCHOFF.

